Dave clearly stated that he does not intend to pay them. Pretends he kept his side by just mailing the check, believe it or not.

He's a welcher and doesn't care. Sad!

Who even made the rule that we cannot group ducks and fish together for the simple reason that they are both aquatic? If I want to group them that way and it serves my purpose then I can jolly well do it however I want to and it is still a nested hierarchy and you can't tell me that it's not.